壳聚糖膜湿热处理及结构分析

用流延法制备壳聚糖膜,并对其进行湿热处理。傅立叶变换红外(FT-IR)光谱图和X-射线衍射(XRD)谱图分析表明,经湿热处理后壳聚糖膜内有类似胺结构形成,并在XRD谱图中的水合结晶峰减弱和无水结晶峰增强。     

甲壳素、壳聚糖及其衍生物的研究进展

对甲壳素、壳聚糖及其衍生物就其发展历史、性质与应用、和发展前景几个方面的研究进展进行了综述．在性质与应用部分里详述了在生物医学、组织细胞移植、医药、临床治疗及环境保护等方面的应用实例。     

Maize seed coatings and seedling sprayings with chitosan and hydrogen peroxide: their influence on some phenological and biochemical behaviors

Objective:To evaluate the effect of chitosan(CH) and hydrogen peroxide(H2O2) seed coatings and seedling sprinklings on two different maize varieties by measuring their phenology,the H2O2 presence,the catalase(CAT) activity,and the protein quantity.Methods:Seven groups of ten seeds for each maize variety were treated with CH(2%(20 g/L) and 0.2%(2 g/L)) or H2O2(8 mmol/L) by coating,sprinkling,or both.Germination and seedling growth were measured.One month after germination,the presence of H2O2 in seedlings in the coated seed treatments was evaluated.Protein content and CAT activity were determined under all treatments.Results:H2O2 seed coating enhanced the germination rate and increased seedling and stem length in the quality protein maize(QPM) variety.Seedlings had a higher emergence velocity under this treatment in both varieties.CH and H2O2 sprinklings did not have an effect on seedling phenology.Exogenous application of H2O2 promoted an increase of endogenous H2O2.CH and H2O2 seedling sprinkling increased the protein content in both maize varieties,while there was no significant effect on the CAT activity of treated seeds and seedlings.Conclusions:CH and H2O2 enhance some phenological and biochemical features of maize depending on their method of application.     

甲壳素/壳聚糖开发和研究进展

作为一种资源丰富，用途广泛的天然高分子化合物，甲壳素／壳聚糖的开发研究和应用范围越来越受到重视，本文对该领域开发和研究进展进行简要评述。     

壳聚糖及其低聚物制备方法的研究进展

壳聚糖资源丰富,已被广泛应用于化工、环保、医药等众多领域,低聚壳聚糖是一种具有多种功能的活性制剂。本文综述了壳聚糖及低聚壳聚糖制备方法的研究及进展。     

氧化降解法制备低聚壳聚糖

采用氧化降解法,制备系列不同相对分子质量壳聚糖.同时考察了过氧化氢浓度对制备产物的影响,并对产物进行红外光谱和热分析研究.     

壳聚糖对苹果酒澄清作用的研究

通过测定壳聚糖澄清前后苹果酒主要成分含量的变化,研究壳聚糖对苹果酒的澄清作用。结果表明：壳聚糖处理后可溶性固形物没有变化,总糖、总酸度、有效酸度等都有不同程度的下降,且苹果酒内的菌数也有所下降。当壳聚糖用量达到0．004g／mL,温度在30℃,作用时间为24h时对苹果酒的澄清效果最好,壳聚糖的应用可以有效地提高苹果酒的澄清度,抑制苹果酒内的菌数,且壳聚糖对苹果酒的澄清作用效果明显优于明胶,说明壳聚糖是一种良好的苹果酒澄清剂。     

番木瓜芹菜复合果蔬汁澄清工艺研制

复合果蔬汁澄清处理工艺的好坏直接影响其品质,添加澄清剂是常用的处理方法,壳聚糖作为常用的澄清剂,便宜且处理效果好又快。本文以壳聚糖为澄清剂,首先通过单因素实验,确定了四个单因素的最佳值：壳聚糖添加量0.08-0.12g/L,澄清温度40-50℃,澄清时间50-60min,复合果蔬汁pH值3.3-3.75,每个单因素各自处于最佳值时,复合果蔬汁的透光率和出汁率均在97%以上。在单因素实验基础上通过正交试验,确定了最佳工艺参数为：壳聚糖用量0.1g/L,澄清温度48℃,澄清时间55min,果蔬汁pH值3.5,在此条件下复合果蔬汁的透光率为98.8%。